Home / 428,860.80-643,291.20-148,406.40

Finding the Fourth Proportional to 428,860.80, 643,291.20 and 148,406.40

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Solution

The fourth proportional to 428,860.80, 643,291.20 and 148,406.40 is: 222,609.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,860.80 : 643,291.20 = 148,406.40 : x
  2. Step 2: Convert to fraction form
    428,860.80/643,291.20 = 148,406.40/x
  3. Step 3: Cross multiply
    428,860.80x = 643,291.20 × 148,406.40
  4. Step 4: Simplify right side
    428,860.80x = 95,468,531,143.68
  5. Step 5: Solve for x
    x = 95,468,531,143.68/428,860.80
  6. Step 6: Final answer
    x = 222,609.60

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.